Merged r11911 from trunk to 2.3-stable (#14182, #14180)

pt-BR translation for 2.3-stable updated by Marcela Oliveira.

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Merged r11919 from trunk to 2.3-stable (#14196)

Italian translation for 2.3-stable by Riccardo Rocca.

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Merged r11920 and r11921 from trunk to 2.3-stable (#14178)

pdf: restore "col_id_width" parameter of issues_to_pdf_draw_borders.

Contributed by Massimo Rossello.

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Merged r11925 from trunk to 2.3-stable (#13692)

prevent coderay "warning: already initialized constant" on Ruby 1.8.7.

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Merged r11932 from trunk to 2.3-stable (#14221)

translate x_hours in many languages.

Contributed by Filou Centrinov.

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Merged r11942 from trunk to 2.3-stable (#14242)

fix that project auto generation fails when projects created in the same time.

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2.3-stable: pin nokogiri version < 1.6.0 (#14245)

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Merged r11980 from trunk to 2.3-stable (#9996)

replace "email.yml" to "configuration.yml" in pl.yml.

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Merged r11982 from trunk to 2.3-stable (#14346)

fix Latvian "button_log_time" translation by Arnis Juraga.

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Merged r11854 from trunk (#13783).

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Merged r11827 to r11833 from trunk (#14015).

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Merged r11839 from trunk (#14020).

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Merged r11915 from trunk (#14186).

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Merged r11869 from trunk (#12888).

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Merged r11906 from trunk (#14101).

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Merged r11905 from trunk (#14103).

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Add more info about the ruby version (#14419).

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Updates for 2.3.2 release.

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Merged r12028 from trunk to 2.3-stable (#14485, #14458)

Traditional Chinese translation for 2.3-stable updated by ChunChang Lo.

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added used plugins